MORTGAGE BANKING AND OTHER SERVICED LOANS - Economic Assumptions Used to Estimate Value of MSRs (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Fair value	$ 1,491	$ 1,552
Weighted-average life (in years)	8 years 8 months 12 days	8 years 9 months 18 days
Weighted-average constant prepayment rate	6.70%	7.20%
Weighted average option adjusted spread	6.32%	6.30%
Minimum
Servicing Assets at Fair Value [Line Items]
Sensitivity analysis, basis spread	10.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Decline in fair value from 10% adverse change	$ 35	$ 37
Decline in fair value from 10% adverse change	$ 42	43
Maximum
Servicing Assets at Fair Value [Line Items]
Sensitivity analysis, basis spread	20.00%
Servicing Assets and Servicing Liabilities at Fair Value, Assumptions Used to Estimate Fair Value [Abstract]
Decline in fair value from 20% adverse change	$ 67	71
Decline in fair value from 20% adverse change	$ 84	$ 87